Trivia

In PGSM, her tombstone reads "Risa Hino 1963-1995", so she was therefore 31 or 32 when she died as Rei was 14 in PGSM, which came out in 2003. Risa gave birth to Rei in the year 1989 at the age of 25 or 26 and died when Rei was 5 or 6.